feat(texture): add texture file

src/texture.cpp

@@ -0,0 +1,64 @@
+#include "texture.hpp"
+#include <iostream>
+
+namespace fs = std::filesystem;
+
+Texture::Texture(const std::string& filename)
+{
+    fs::path path = fs::absolute(fs::current_path() / "res/textures" / filename);
+
+    int maxTextureSize;
+    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxTextureSize);
+
+    glGenTextures(1, &id);
+    glBindTexture(GL_TEXTURE_2D, id);
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+    int imgW, imgH, numColCh;
+    stbi_set_flip_vertically_on_load(true);
+    unsigned char* data = stbi_load(path.string().c_str(), &imgW, &imgH, &numColCh, 0);
+
+    if (!data)
+    {
+        std::cerr << "Error loading image: " << path << std::endl;
+        return;
+    }
+
+    int loadedTextureSize = imgW * imgH;
+
+    if (loadedTextureSize >= maxTextureSize)
+    {
+        std::cerr << "Error: max texture size is " << maxTextureSize
+                  << " pixels, but image size = " << loadedTextureSize << std::endl;
+        stbi_image_free(data);
+        return;
+    }
+
+    GLenum format = (numColCh == 4) ? GL_RGBA : GL_RGB;
+
+    glTexImage2D(GL_TEXTURE_2D, 0, format, imgW, imgH, 0, format, GL_UNSIGNED_BYTE, data);
+    glGenerateMipmap(GL_TEXTURE_2D);
+
+    stbi_image_free(data);
+}
+
+Texture::~Texture()
+{
+    glDeleteTextures(1, &id);
+}
+
+void Texture::bind(GLenum textureUnit) const
+{
+    glActiveTexture(textureUnit);
+    glBindTexture(GL_TEXTURE_2D, id);
+}
+
+unsigned int Texture::getID() const
+{
+    return id;
+}